CN206685389U - Organic Light Emitting Diode Display Device - Google Patents

Abstract

An organic light emitting diode display device comprises an active array substrate, at least one organic light emitting diode and a packaging plate. The active array substrate comprises a light absorption layer and at least one active element. The active device is located above the light absorption layer. The organic light emitting diode is arranged above the active array substrate. The organic light emitting diode includes a first electrode, a second electrode, and an organic light emitting layer. The first electrode is disposed on a side adjacent to the active device. The second electrode is arranged opposite to the first electrode, wherein the transmittance of the first electrode and the second electrode in a wavelength within the visible wavelength range is more than 0.6. The organic light emitting layer is sandwiched between the first electrode and the second electrode. The packaging plate is arranged above the organic light emitting diode. The first electrode and the second electrode are made of materials with low optical reflectivity and high optical transmittance, and the original optical reflection phenomenon is reduced and eliminated by the light absorption layer, so that the bright room contrast of the organic light emitting diode display device is improved.

Description

Organic Light Emitting Diode Display Device

technical field

The utility model relates to an organic light emitting diode display device.

Background technique

Organic light-emitting diode displays are regarded as the mainstream technology of the next generation. In traditional organic light emitting diode displays, in order to improve light extraction efficiency, materials with high reflectivity are used as the driving electrodes of organic light emitting diodes, so that the light emitted downward can be reflected upward by the driving electrodes below, thereby obtaining higher light extraction efficiency. . In addition, some people have proposed organic light-emitting diode displays with micro-optical resonant cavities. In this technology, in addition to the high-reflectivity materials that must be used for the lower driving electrodes of organic light-emitting diodes, the upper driving electrodes must also have certain reflectivity. This type of display can provide better color saturation and higher brightness at the front viewing angle, but it also has some disadvantages. For example, although the brightness and color saturation of the display are improved in the front viewing direction, the color distortion of images with large viewing angles is caused, and the brightness decreases significantly as the viewing angle increases.

In the above-mentioned technologies, although a high light extraction efficiency is obtained, some problems are also caused. For example, electrodes with high reflectivity will reflect the incident light from the outside world, so when the user is in a high-brightness ambient light source (for example, outdoor sunlight), the light reflected from the outside through the panel will seriously affect the original display. display screen, causing the user to be unable to clearly see the display screen of the original monitor. In addition, in the technology of micro optical resonant cavity, although this technology can provide better color saturation and higher brightness at the front viewing angle, it also faces the same problem because electrodes with high optical reflection must be used.

In order to solve the above problems, in the known technology, a set of anti-reflection optical films is added above the display surface of the OLED display to reduce the reflection phenomenon of the OLED panel to the external light. The structure of this anti-reflection optical film set is composed of a polarizer and a 1/4 wave plate (1/4λ wave plate). Although the anti-reflection optical film group with this structure solves the problem of reflection of external light, it causes the brightness loss of the organic light-emitting diode display to reach 50%-60% at the same time (because the transmittance of a polarizer is only about 40-50%) , and cause an increase in the thickness and weight of the overall device. Therefore, it is necessary to propose a new organic light emitting diode display panel to improve this existing technical problem.

In addition, the organic light-emitting materials and highly active electrodes in the existing organic light-emitting diode displays are made of materials that are easily affected by moisture and oxygen. Therefore, the existing organic light-emitting diode displays require strict packaging processes to avoid external water Gas and oxygen enter and reduce the service life of the organic light emitting diode. At present, glass substrates are most commonly used as the upper and lower substrates of OLEDs, and the glass substrates are used to reduce the penetration rate of water vapor and oxygen to ensure the life and quality of OLED elements. However, if the overall weight, thickness, and even future flexible applications are considered, it is inevitable to use plastic substrates, but the use of plastic substrates will reduce the ability to block moisture and oxygen penetration, thereby reducing The lifespan and quality of organic light-emitting diodes.

Utility model content

One or more embodiments of the present invention disclosed below can solve the above-mentioned reflection problem of ambient light, and compared with the external anti-reflection film group, the embodiments of the present invention can improve the overall luminous efficiency of the OLED display device . In addition, the reliability of the organic light emitting diode display device can be improved, and it is more suitable for flexible applications.

According to some embodiments of the present invention, an OLED display device is disclosed. The OLED display device disclosed herein includes an active array substrate, at least one OLED and a packaging board. The active array substrate includes a light absorbing layer and at least one active device. The active element is located above the light absorbing layer. The organic light emitting diode is arranged above the active array substrate. The organic light emitting diode includes a first electrode, a second electrode and an organic light emitting layer. The first electrode is arranged on one side adjacent to the active element. The second electrode is arranged opposite to the first electrode, wherein the transmittance of the first electrode and the second electrode at one wavelength within the visible light wavelength range is greater than 0.6. The organic light emitting layer is sandwiched between the first electrode and the second electrode. The packaging board is arranged above the organic light emitting diode.

In one embodiment, the active array substrate further includes a carrier, the light absorbing layer is disposed on the first surface of the carrier, and the active device is disposed on the light absorbing layer.

In one embodiment, the active array substrate further includes a carrier, the light absorbing layer is disposed on the second surface of the carrier, and the light absorbing layer and the active device are disposed on opposite sides of the carrier.

In one embodiment, the light absorbing layer constitutes a carrier of the active array substrate, and the active element is disposed on the carrier.

In one embodiment, the light absorbing layer is a single-layer structure of organic material or inorganic material, or a multi-layer structure of composite organic material and inorganic material.

In one embodiment, the light-absorbing layer is a light-absorbing layer having a reflectance of less than 0.3 at one wavelength within the visible wavelength range.

In one embodiment, the light-absorbing layer is a light-absorbing layer having an optical density greater than 0.7 at one wavelength in the visible wavelength range.

In one embodiment, the active array substrate further includes a light-shielding layer disposed above the active device.

In one embodiment, the light-shielding layer is aligned with the active device, and the area of the light-shielding layer is larger than that of the active device.

In one embodiment, the light shielding layer is aligned with a metal wire of the active device and completely covers the metal wire.

In one embodiment, the OLED display device further includes a color filter layer. The color filter layer is arranged between the organic light-emitting layer and the packaging board.

Description of drawings

1-4 are schematic cross-sectional views of OLED display devices according to various embodiments of the present invention.

detailed description

In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the implementation and specific embodiments of the present utility model; but this is not the only form for implementing or using the specific embodiments of the present utility model. The various embodiments disclosed below can be combined or replaced with each other when beneficial, and other embodiments can also be added to one embodiment, without further description or illustration. In the following description, numerous specific details will be set forth in order to enable readers to fully understand the following embodiments. However, embodiments of the invention may be practiced without these specific details. In other instances, well-known structures and devices are only schematically shown in order to simplify the drawings.

In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the implementation and specific embodiments of the present utility model; but this is not the only form for implementing or using the specific embodiments of the present utility model. In the following description, numerous specific details will be set forth in order to enable readers to fully understand the following embodiments. However, embodiments of the invention may be practiced without these specific details. In other instances, well-known structures and devices are only schematically shown in order to simplify the drawings. As used herein, the terms "about", "approximately" or "approximately" generally mean that the error or range of the value is within about 20%, preferably within about 10%, and more preferably It is within about five percent. If there is no explicit statement in the text, the numerical values mentioned are regarded as approximate values, that is, the error or range indicated by "about", "approximately" or "approximately". Herein, when an element is referred to as being "connected" or "coupled" to another element, it may be that an element is directly connected or coupled to another element; A plurality of additional elements, that is, one element is connected to another element via one or more additional elements. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no additional elements present in between.

One or more implementations of the present invention disclosed below can solve the above-mentioned technical shortcomings. One or more embodiments of the present invention disclosed below can not only solve the problem of reflection of external light, but also not cause the brightness of the OLED display to drop significantly.

In one or more embodiments of the present invention disclosed below, the traditional idea of high reflective electrodes is discarded, and materials with low optical reflectivity and high transmittance are used as electrodes of OLEDs, and an optical absorption layer is provided. In one or more embodiments of the present invention disclosed below, not only the problem of ambient light reflection caused by the driving electrodes with high reflectivity is avoided, but also no additional anti-reflection film set is required. Thus, the overall luminous efficiency is increased by about 25% (compared with the traditional external anti-reflection film group).

FIG. 1 shows a schematic cross-sectional view of an OLED display device 100 according to various embodiments of the present invention. The OLED display device 100 includes an active matrix substrate 110 , at least one OLED 120 and a packaging board 140 . The OLED 120 is disposed between the active array substrate 110 and the packaging board 140 .

The active array substrate 110 includes at least one active device 112 , a light shielding layer 114 and a light absorbing layer 130 . The active devices 112 can be configured in an array form in the active array substrate 110 . In some embodiments, the active device 112 may be, for example, a polysilicon thin film transistor, an amorphous silicon thin film transistor, or a metal oxide thin film transistor. The specific implementation and details of the light-shielding layer 114 and the light-absorbing layer 130 will be described in more detail below.

The organic light emitting diode 120 is disposed above the active array substrate 110 , and the organic light emitting diode 120 includes a first electrode 121 , a second electrode 122 and an organic light emitting layer 124 .

The first electrode 121 is disposed adjacent to one side of the active device 112 , and the second electrode 122 is disposed opposite to the first electrode 121 . In some embodiments, the first electrode 121 and the second electrode 122 are made of materials with low reflectivity and high transmittance. The transmittance of one of the wavelengths in the visible light wavelength range of the first electrode 121 and the second electrode 122 is greater than about 0.6, such as about 0.7, 0.8, 0.9, 0.95 or higher; and one of the wavelengths in the visible light wavelength range The reflectance of is less than about 0.3, such as about 0.25, 0.2, 0.15, 0.1 or less. The material of the first electrode 121 and/or the second electrode 122 is preferably a material with low activity and both optical low reflectivity and high transmittance, such as indium tin oxide (indium tinoxide, ITO), indium oxide Zinc (indium zinc oxide, IZO), aluminum zinc oxide (aluminum zinc oxide, AZO), indium zinc tin oxide (indium tin zinc oxide, ITZO), cadmium tin oxide (CTO), tin oxide (tin oxide) , zinc oxide (zinc oxide), cadmium oxide (cadmium oxide), indium gallium zinc oxide (InGaZnO), indium gallium zinc magnesium oxide (InGaZnMgO), indium gallium aluminum oxide (indium gallium aluminum oxide, InGaAlO) or indium gallium magnesium oxide (InGaMgO), etc., but not limited thereto.

The organic light emitting layer 124 is sandwiched between the first electrode 121 and the second electrode 122 . In some embodiments, the organic light emitting layer 124 is a multi-layer structure. For example, the organic light emitting layer 124 may include a hole injection layer (Hole Injection Layer, HIL), a hole transport layer (Hole Transport Layer, HTL), a light emitting layer (Emitting Layer, EML), a hole blocking layer (Hole Blocking Layer, HBL) and electron transport layer (Electron Transport Layer, ETL), etc., but not limited thereto.

The light absorbing layer 130 is disposed under the active device 112 . The light absorbing layer 130 is used for absorbing light incident into the OLED display from the environment. As mentioned above, the first and second electrodes 121 and 122 of the organic light emitting diode 120 are made of conductive materials with high transmittance and low reflectivity, so in the light emitting direction of the display surface, this high transmittance The high-efficiency electrode provides high transmittance without blocking or absorbing the light emitted by the OLED 120 . For the incident light from the outside, due to the low reflectivity, the reflection phenomenon of the incident light from the environment can be reduced. In addition, the light absorbing layer 130 is disposed on the active array substrate 110. When light incident from the external environment passes through the first and second electrodes 121 and 122 with high transmittance and low reflectance and reaches the light absorbing layer 130, these Incident light is absorbed by the light absorbing layer 130 . Therefore, the original optical reflection phenomenon can be reduced and eliminated, thereby improving the bright room contrast of the OLED display device 100 .

In some embodiments, the active array substrate 110 further includes a carrier 111 , and the carrier 111 has a first surface 111 a and a second surface 111 b opposite to each other. The light absorbing layer 130 is disposed on the first surface 111 a of the carrier 111 , and the active device 112 is disposed on the light absorbing layer 130 . In some embodiments, the reflectance of the light absorbing layer 130 at one wavelength within the visible wavelength range is less than about 0.3, such as about 0.25, 0.2, 0.15, 0.1 or less. In other embodiments, the optical density of the light absorbing layer 130 at one wavelength in the visible light wavelength range is greater than about 0.7, such as about 0.75, 0.8, 0.85, 0.9, or higher. In some embodiments, the material of the light absorbing layer 130 may include organic and/or inorganic materials, such as dyes, pigments, graphite carbon, titanium black, carbon black and/or cesium tungsten oxide, etc. The diameter may be, for example, about 10 nanometers to about 2 micrometers, but is not limited thereto.

The light-shielding layer 114 is disposed above the active device 112 to prevent the active device 112 from being irradiated by light and causing electric leakage. In detail, the first and second electrodes 121 and 122 of the OLED 120 are made of conductive materials with high transmittance and low reflectivity, so incident light from the environment may irradiate the active device 112 . In addition, the light emitted by the OLED will also irradiate the active device 112 . Therefore, the light-shielding layer 114 is disposed on the active device 112 to prevent the active device 422 from generating leakage current due to light emitted by the OLED 120 or incident light from the environment. In some embodiments, the light shielding layer 114 is aligned with the active device 112 , and the area of the light shielding layer 114 is larger than the area of the active device 112 . In some embodiments, the light-shielding layer 114 is aligned with a metal wire (not shown) of the active device 112 and completely covers the metal wire, so as to prevent the metal wire from being reflected by incident light from the environment. The light shielding layer 114 can be configured in any layer structure above the active device 112 .

In one embodiment, the active array substrate 110 further includes a protection layer 160 , the protection layer 160 covers the active device 112 , and the light shielding layer 114 is disposed on the protection layer 160 . In another embodiment, the light shielding layer 114 is sandwiched between the protection layer 160 and the active device 112 . In some embodiments, the light shielding layer 114 is made of insulating material, and the light shielding layer 114 contacts and covers the active device 112 . In some other embodiments, the light-shielding layer 114 is made of metal material and disposed on the protective layer 160 . In other embodiments, the optical density of the light-shielding layer 114 at one wavelength of the visible light wavelength range is greater than about 0.7, such as about 0.75, 0.8, 0.85, 0.9, or higher. In some embodiments, the active array substrate 110 further includes a pixel definition layer 174 , and the pixel definition layer 174 can be made of black resin, for example. The light shielding layer 114 is located between the pixel definition layer 174 and the active device 112 . In one embodiment, the area of the light shielding layer 114 is larger than that of the pixel definition layer 174 , in other words, the coverage area of the light shielding layer 114 is larger than the coverage area of the pixel definition layer 174 .

The encapsulation board 140 is disposed above the second electrode 122 and forms a closed space S with the active array substrate 110 to isolate the OLED 120 from the outside, thereby avoiding performance degradation of the OLED 120 . In detail, the organic light-emitting layer and the cathode in the organic light-emitting diode are usually affected by water and/or oxygen and deteriorate. If water or oxygen penetrates into an OLED display, it will seriously reduce the lifetime of the display. In this embodiment, the packaging board 140 is used to prevent external oxygen and/or moisture from contacting the components in the OLED display device 100 . For example, the OLED display device 100 may further include a sealing layer 170 disposed between the packaging board 140 and the active array substrate 110 , and the sealing layer 170 surrounds the active device 112 and the OLED 120 . The sealing layer 170 , the encapsulation board 140 and the active array substrate 110 form a closed space S, thereby preventing water and/or oxygen in the environment from entering the OLED touch device 100 .

The packaging board 140 may include a rigid substrate, such as glass; or a flexible substrate, such as polycarbonate (polycarbonate, PC), polyethylene terephthalate (polyethylene terephthalate, PET), polymethylmethacrylate Fat (polymethylmesacrylate, PMMA), polysulfone (Polysulfone, PES) or other cyclic olefin copolymer (cyclic olefin copolymer).

According to various embodiments of the present utility model, the idea of using highly active electrodes is abandoned, and materials with low activity and both optical low reflectivity and high transmittance are used as the first electrode 121 and the second electrode 122, and by setting The light absorbing layer 130 reduces and eliminates the original optical reflection phenomenon, thereby improving the bright room contrast of the OLED display device 100 . Therefore, the present invention does not require additional anti-reflection film layers or modules like the known technology, so the light intensity emitted by the original organic light-emitting diode 120 will not be reduced, and the overall luminous efficiency is compared with the traditional use of plug-in The display of the anti-reflection film layer or module can be increased by about 25%, and the thickness and weight of the whole organic light emitting diode display device 100 will not be significantly increased. In addition, the optical absorption layer 130 can also provide the function of blocking the penetration of water and oxygen. When considering the overall weight and thickness of the light-emitting diode display device 100, and even future flexible applications, the optical absorption layer 130 can make up for the use of plastic substrates. The resulting problem of poor sealing effect is to improve the ability to block the penetration of water and oxygen, thereby increasing the lifespan of the light emitting diode display device 100 .

In other embodiments of the present invention, the optical absorption layer 170 can further be a single-layer dense structure of organic material or inorganic material, or a multi-layer structure in which organic material and inorganic material are interlaced. The specific effect can be to isolate water vapor and oxygen from the outside, or to absorb water vapor and oxygen, or to have the function of isolating and absorbing water and oxygen at the same time, so as to prevent water vapor and oxygen from penetrating into the LED display device 100 internal role.

FIG. 2 is a schematic cross-sectional view of an OLED display device 100 a according to another embodiment of the present invention. The biggest difference between the organic light emitting diode display device 100a and the above organic light emitting diode display device 100 in the embodiment of FIG. 112 are disposed on opposite sides of the carrier board 111 . Other elements of the OLED display device 100 a are the same as those described above with respect to the OLED display device 100 .

FIG. 3 is a schematic cross-sectional view of an OLED display device 100b according to another embodiment of the present invention. The biggest difference between the organic light emitting diode display device 100b and the organic light emitting diode display device 100 in the embodiment of FIG. 1 is that the carrier 111c of the active array substrate 110 has the function of absorbing light. In other words, the light absorbing layer 130 shown in FIG. 1 and the carrier 111 of the active array substrate are integrated into a single layer structure, the light absorbing layer 130 is the carrier 111c of the active array substrate 110, and the active device 112 is disposed on an absorbing light capability on the carrier board 111c. Other components of the OLED display device 100 b are the same as those described above with respect to the OLED display device 100 .

FIG. 4 is a schematic cross-sectional view of an OLED display device 100c according to another embodiment of the present invention. The biggest difference between the organic light emitting diode display device 100c and the above organic light emitting diode display device 100 in the embodiment of FIG. Between the packaging boards 140 , the color filter layer 150 may, for example, include a red filter layer, a green filter layer and a blue filter layer. In this embodiment, the OLED display device 100c includes red OLEDs, green OLEDs and blue OLEDs. The organic light emitting layers 124 of the organic light emitting diodes 120 of each color are aligned with the corresponding red filter layer, green filter layer and blue filter layer.

The color filter layer 150 itself is an optical absorption layer, for example, the red filter layer allows red light to pass through, while light in other wavelength bands will be absorbed. Because the red OLED, the green OLED, and the blue OLED are respectively aligned with the red filter layer, the green filter layer, and the blue filter layer, the color filter layer 150 hardly consumes the OLED 120. of self-illumination. On the contrary, the color filter layer 150 can absorb the incident light from the outside, and the part of the incident light from the outside that is not absorbed by the color filter layer 150 passes through the second electrode 122, the organic light emitting layer 124, the first electrode 121, etc. layer, and finally reaches the light absorbing layer 130 to be further absorbed and blocked. In this way, the reflection intensity can be further reduced, and the bright room contrast of the display can be improved.

Under the framework of the organic light emitting diode display device 100c having the color filter layer 150, in other embodiments, the light absorbing layer 130 can be located at any position under the active device 112, such as the embodiments described above with respect to FIG. 2 and FIG. 3 or example.

Although the present utility model has been disclosed as above in terms of implementation, it is not intended to limit the present utility model. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the scope of protection of the present utility model should be as defined by the appended claims. Unless otherwise defined, all terms (including technical and scientific terms) used herein have their ordinary meanings that can be understood by those skilled in the art. Furthermore, the definitions of the above-mentioned words in the commonly used dictionaries shall be interpreted in the content of this specification as meanings consistent with the relevant fields of the present invention. Unless specifically defined, these terms are not to be interpreted in an idealized or overly formal sense.

Claims (11)

1. An organic light emitting diode display device, characterized in that it comprises: An active array substrate, comprising a light absorbing layer and at least one active element located above the light absorbing layer; At least one organic light emitting diode is disposed above the active array substrate, and the organic light emitting diode includes: a first electrode disposed on a side adjacent to the active element; a second electrode disposed opposite to the first electrode, wherein the The first electrode and the second electrode have a transmittance greater than 0.6 at one wavelength in the visible light wavelength range; and an organic light-emitting layer is interposed between the first electrode and the second electrode; and A packaging board is arranged above the organic light emitting diode. 2. The OLED display device according to claim 1, wherein the active array substrate further comprises a carrier, the light absorbing layer is disposed on a first surface of the carrier, and the active element is disposed on on the light absorbing layer. 3. The organic light emitting diode display device according to claim 1, wherein the active array substrate further comprises a carrier, the light absorbing layer is disposed on a second surface of the carrier, and the light absorbing layer and The active element is arranged on two opposite sides of the carrier board. 4 . The organic light emitting diode display device according to claim 1 , wherein the light absorbing layer constitutes a carrier of the active array substrate, and the active device is disposed on the carrier. 5 . The organic light emitting diode display device according to claim 1 , wherein the light absorbing layer is a single-layer structure of organic material or inorganic material, or a multi-layer structure of composite organic material and inorganic material. 6 . 6 . The OLED display device according to claim 1 , wherein the light-absorbing layer is a light-absorbing layer with a reflectance of less than 0.3 at one wavelength in the visible wavelength range. 7 . 7 . The OLED display device according to claim 1 , wherein the light-absorbing layer is a light-absorbing layer having an optical density greater than 0.7 at one wavelength within the visible light wavelength range. 8 . 8 . The organic light emitting diode display device according to claim 1 , wherein the active array substrate further comprises a light-shielding layer disposed above the active device. 9 . The organic light emitting diode display device according to claim 8 , wherein the light-shielding layer is aligned with the active device, and the area of the light-shielding layer is larger than that of the active device. 10 . The OLED display device according to claim 8 , wherein the light-shielding layer is aligned with a metal wire of the active device and completely covers the metal wire. 11 . 11. The OLED display device according to claim 1, further comprising: A color filter layer is arranged between the organic light-emitting layer and the encapsulation board.